A boron-dipyrrin–mercury(ii) complex as a fluorescence turn-on sensor for chloride and applications towards logic gates
作者:Sheri Madhu、R. Kalaiyarasi、Santanu Kumar Basu、Sameer Jadhav、Mangalampalli Ravikanth
DOI:10.1039/c3tc32188f
日期:——
Chloride (Clâ) plays an important role in many cellular responses, including control of membrane potential, neurotransmission, regulation of cell volume and charge balance. Due to its physiological relevance, there is a growing need for improved optical sensors that can detect Clâ ions in biological and environmental samples. Herein, we have developed new N-acylhydrazone substituted BODIPYâmercury(II) based fluorescent turn-on sensors 1âHg2+ and 2âHg2+, which showed remarkable selectivity and specificity towards Clâ ions under physiological conditions. The new BODIPY compounds 1 and 2 were synthesized by treating their corresponding 3,5-diformyl BODIPYs 3 and 4 with isonicotinohydrazide in one step under simple reaction conditions. Compounds 1 and 2 absorb in 615â650 nm and emit in 625â660 nm regions. BODIPYs 1 and 2 showed exclusive sensing towards Hg2+ and formed 1âHg2+ and 2âHg2+ complexes, respectively, which resulted in the quenching of fluorescence. Job's plot analyses and HR-MS studies supported the formation of 1âHg2+ and 2âHg2+ complexes. Complexes 1âHg2+ and 2âHg2+ were found to be exclusive fluorescence turn-on sensors for chloride ions. Upon addition of Clâ ions to 1âHg2+ and 2âHg2+ complexes, the mercury(II) ions were extracted from the complexes by releasing the free BODIPYs 1 and 2 which reflected in the significant enhancement of fluorescence intensity (22-fold) with a detection limit of 108 nM. The reversibility and reusability of sensors for the detection of Hg2+ and Clâ ions were tested for six cycles. Interestingly, the sensor can be used to construct an IMPLIES logic gate system as demonstrated in this paper. Furthermore, the probe is cell membrane-permeable and can readily be used to detect the intracellular Clâ ions.
氯离子(Clâ)在许多细胞反应中发挥着重要作用,包括控制膜电位、神经传递、调节细胞体积和电荷平衡。由于氯离子的生理相关性,人们越来越需要能够检测生物和环境样品中氯离子的改进型光学传感器。在此,我们开发了新的 N-酰基腙取代 BODIPY 腙(II)型荧光导通传感器 1âHg2+ 和 2âHg2+ ,它们在生理条件下对 Clâ 离子具有显著的选择性和特异性。新的 BODIPY 化合物 1 和 2 是在简单的反应条件下,用异烟酰肼一步法处理相应的 3,5-二甲酰基 BODIPY 3 和 4 而合成的。化合物 1 和 2 在 615- 650 纳米波段吸收,在 625- 660 纳米波段发射。BODIPYs 1 和 2 对 Hg2+ 具有专一感应,并分别形成 1âHg2+ 和 2âHg2+ 复合物,从而导致荧光淬灭。约伯图分析和 HR-MS 研究证实了 1Hg2+ 和 2Hg2+ 复合物的形成。研究发现,1âHg2+ 和 2âHg2+ 复合物是氯离子的专用荧光开启传感器。在 1Hg2+ 和 2Hg2+ 复合物中加入氯离子后,汞(II)离子从复合物中被提取出来,释放出游离的 BODIPYs 1 和 2,从而使荧光强度显著增强(22 倍),检测限为 108 nM。对传感器检测 Hg2+ 和 Clâ 离子的可逆性和可重复使用性进行了六个周期的测试。有趣的是,正如本文所展示的,该传感器可用于构建 IMPLIES 逻辑门系统。此外,该探针具有细胞膜渗透性,可用于检测细胞内的 Clâ 离子。